Don't think of it as 'replicating' these things. The Old West was as it was for perfectly good reasons, reasons that apply equally well to the 'verse...
I do understand Whedon's rationale as stated in my original post, no need to explain it again. I just found said rationale to be rather boring and predictable. Whedon himself has admitted that he knows nothing about science fiction, he was more interested in the characters. All I was trying to do was suggest a more fanciful alternative to what was already given.